package com.nowcoder.community.entity;
/*
    封装分页相关的信息
 */
public class Page {
    //当前页码
    private int current = 1;
    //显示上线
    private int limit = 10;
    //数据总数
    private int rows;
    //查询路径（用于复用分页链接）
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current >= 1) {
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit >= 1 && limit <= 100){
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows >= 0){
            this.rows = rows;
        }
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }
    /*
    获取当前的起始行
     */
    public int getOffset(){
        //current * limit -limit
        return (current-1) * limit;
    }
    /*
    获取总页数
     */
    public int getTotal() {
        // row / limit [+1]
        if(rows % limit == 0){
            return rows/limit;
        }else{
            return rows / limit +1;
        }
    }
    /*
    获取起始页码
     */
    public int getFrom(){
        int from = current -2;
        return from < 1?1:from;
    }
    /*
    获取结束页码
     */
    public int getTo(){
        int to = current+2;
        int total = getTotal();
        return to > total ? total : to;
    }

}
